The library givaro is a library for arithmetic and algebraic computations, is required for fflas-ffpack, and is available from https://github.com/linbox-team/givaro.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Macaulay2Doc/ov_preface.m2:113:0.